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dc.contributor.authorHyland, Sara Elizabethen_US
dc.date.accessioned2014-03-14T20:38:20Z
dc.date.available2014-03-14T20:38:20Z
dc.date.issued2005-05-13en_US
dc.identifier.otheretd-05232005-081624en_US
dc.identifier.urihttp://hdl.handle.net/10919/33148
dc.description.abstractIncreased stormwater runoff due to urban development in the northern Shenandoah Valley (NSV) region of Virginia has prompted local officials and representatives to consider Low Impact Development (LID) as a stormwater management technique. LID is based on infiltrating stormwater runoff at the source through practices such as bioretention, rain gardens, and grass swales. The karst terrain that underlies the Shenandoah Valley presents a major barrier to the use of LID. Infiltration of surface runoff in karst landscapes may threaten groundwater quality and the stability of the bedrock. In 2004 the Center for Geospatial Information Technology (CGIT) at Virginia Tech developed an LID site suitability model for the NSV region incorporating karst as a key component in distinguishing unsuitable from suitable conditions for LID. But, due to the difficulty of mapping karst, the karst layer used in the site suitability model is very coarse in resolution, based primarily on carbonate versus non-carbonate rock. This study uses a 1:24,000 scale sinkhole map derived from sinkhole boundaries identified by geologist David Hubbard (1984) of the Virginia Department of Mines and Minerals (DMME) to develop a more detailed karst map for a sub-watershed of the NSV region. The analysis uses geospatial techniques to determine the relationship between sinkhole distribution and four major landscape factors: bedrock type, soil depth to bedrock, proximity to geologic faults, and proximity to surface streams. The analysis identified three major trends in sinkhole occurrence: (1) sinkholes are more abundant in relatively pure carbonate rocks of Ordivician age; (2) sinkhole occurrence increases with proximity to fault lines; and (3) sinkholes are sparse near streams, most abundant 600 to 1400 feet away from surface streams. Based on these findings a sinkhole susceptibility index was produced using weighted overlay analysis in ArcGIS. The sinkhole susceptibility index provides a more detailed karst layer for the LID site suitability maps and can be used by the NSV region as a predictive tool for future sinkhole occurrence.en_US
dc.publisherVirginia Techen_US
dc.relation.haspartHylandETD.pdfen_US
dc.rightsI hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to Virginia Tech or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.en_US
dc.subjectspatial overlay analysisen_US
dc.subjectsurface runoffen_US
dc.subjectwater qualityen_US
dc.subjectGISen_US
dc.subjectLIDen_US
dc.subjectsinkholesen_US
dc.subjectkarsten_US
dc.titleANALYSIS OF SINKHOLE SUSCEPTIBILITY AND KARST DISTRIBUTION IN THE NORTHERN SHENANDOAH VALLEY, VIRGINIA: IMPLICATIONS FOR LOW IMPACT DEVELOPMENT (LID) SITE SUITABILITY MODELSen_US
dc.typeThesisen_US
dc.contributor.departmentGeographyen_US
dc.description.degreeMaster of Scienceen_US
thesis.degree.nameMaster of Scienceen_US
thesis.degree.levelmastersen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineGeographyen_US
dc.contributor.committeechairKennedy, Lisa M.en_US
dc.contributor.committeememberParson, Shaneen_US
dc.contributor.committeememberYounos, Tamimen_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-05232005-081624/en_US
dc.date.sdate2005-05-23en_US
dc.date.rdate2005-06-15
dc.date.adate2005-06-15en_US


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